A constant box pops up... the outlook asking for my username and password.. cannot stop it or use Outlook

Hello..
I have been using Outlook with Yahoo as a POP account for a long time... just today I get a constant pop-up box for Outlook saying "please type your username and password".... the correct username and password are already in the box... even when I redo them it is no help... the box constantly comes up right after I cancel it... I called Yahoo and all the settings in the Yahoo account are correct.... I cannot send or receive e-mail from my outlook because of this..
please help me
Deek

1. Register an important send/receive library file. Go to Start > Run and type regsvr32 inetcomm.dll

2. Check if antivirus email check is slowing sending and receiving. Disable it. Check if other programs running in the background is interfering. Disable one at a time the Firewall, antispyware, antispam, and all Norton programs.

3. In the account settings, Advanced settings, change the server timeout time from 1 min to 5 min

4. Outgoing mail server authentication is required. Select that option in account settings and use same settings as incoming server

5. Your ISP may be blocking port 25. Try using alternate port 587.

If no joy, you need to use your ISP SMTP server to send out emails.

6. Check with Yahoo Tech Support to determine if server is having trouble. Ask for Level 2 Tech.

Hello war...
I already had done number two and number four and number five....
I did number three , the one with the server timeout and that seemed to solve everything...
it seems so strange that something as simple as that would solve it but for now everything is working fine and I appreciate your help.
Regards deek

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